Tangyuan is the traditional food for the Lantern Festival or Yuanxiao Festival. Obviously, they get the name from the festival itself. Made of sticky rice flour filled with sweet stuffing and round in shape, it symbolizes family unity, completeness and happiness.
The fillings inside the dumplings or yuanxiao are either sweet or salty. Sweet fillings are made of sugar, walnuts, sesame, osmanthus flowers, rose petals, sweetened tangerine peel, bean paste, or jujube paste. A single ingredient or any combination can be used as the filling. The salty variety is filled with minced meat, vegetables or a mixture.
(the inroduction and picture are taken from the Internet)